Just to support Ygrec a bit, this happened to me this morning, and went on for some minutes. I wrote it down and saved it as a text file to post later, when I anticipated PC would be available again:

At about 2:15 this morning, something was wrong with PC. I could not get it to respond to clicks on My Profile, or on any of the forum links, including this one, Community Support & Technical Feedback, to leave a message about it. It would respond to a click on Log Out.